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1046ee088f
Fix calculation of _desired, in free list statistics, which was missing an intended set of parentheses. Reviewed-by: poonam, jmasa
168 lines
7 KiB
C++
168 lines
7 KiB
C++
/*
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* Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#ifndef SHARE_VM_GC_IMPLEMENTATION_SHARED_ALLOCATIONSTATS_HPP
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#define SHARE_VM_GC_IMPLEMENTATION_SHARED_ALLOCATIONSTATS_HPP
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#ifndef SERIALGC
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#include "gc_implementation/shared/gcUtil.hpp"
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#include "memory/allocation.hpp"
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#include "utilities/globalDefinitions.hpp"
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#endif
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class AllocationStats VALUE_OBJ_CLASS_SPEC {
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// A duration threshold (in ms) used to filter
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// possibly unreliable samples.
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static float _threshold;
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// We measure the demand between the end of the previous sweep and
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// beginning of this sweep:
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// Count(end_last_sweep) - Count(start_this_sweep)
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// + splitBirths(between) - splitDeaths(between)
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// The above number divided by the time since the end of the
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// previous sweep gives us a time rate of demand for blocks
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// of this size. We compute a padded average of this rate as
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// our current estimate for the time rate of demand for blocks
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// of this size. Similarly, we keep a padded average for the time
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// between sweeps. Our current estimate for demand for blocks of
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// this size is then simply computed as the product of these two
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// estimates.
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AdaptivePaddedAverage _demand_rate_estimate;
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ssize_t _desired; // Demand stimate computed as described above
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ssize_t _coalDesired; // desired +/- small-percent for tuning coalescing
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ssize_t _surplus; // count - (desired +/- small-percent),
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// used to tune splitting in best fit
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ssize_t _bfrSurp; // surplus at start of current sweep
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ssize_t _prevSweep; // count from end of previous sweep
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ssize_t _beforeSweep; // count from before current sweep
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ssize_t _coalBirths; // additional chunks from coalescing
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ssize_t _coalDeaths; // loss from coalescing
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ssize_t _splitBirths; // additional chunks from splitting
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ssize_t _splitDeaths; // loss from splitting
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size_t _returnedBytes; // number of bytes returned to list.
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public:
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void initialize(bool split_birth = false) {
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AdaptivePaddedAverage* dummy =
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new (&_demand_rate_estimate) AdaptivePaddedAverage(CMS_FLSWeight,
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CMS_FLSPadding);
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_desired = 0;
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_coalDesired = 0;
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_surplus = 0;
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_bfrSurp = 0;
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_prevSweep = 0;
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_beforeSweep = 0;
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_coalBirths = 0;
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_coalDeaths = 0;
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_splitBirths = split_birth? 1 : 0;
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_splitDeaths = 0;
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_returnedBytes = 0;
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}
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AllocationStats() {
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initialize();
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}
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// The rate estimate is in blocks per second.
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void compute_desired(size_t count,
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float inter_sweep_current,
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float inter_sweep_estimate,
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float intra_sweep_estimate) {
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// If the latest inter-sweep time is below our granularity
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// of measurement, we may call in here with
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// inter_sweep_current == 0. However, even for suitably small
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// but non-zero inter-sweep durations, we may not trust the accuracy
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// of accumulated data, since it has not been "integrated"
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// (read "low-pass-filtered") long enough, and would be
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// vulnerable to noisy glitches. In such cases, we
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// ignore the current sample and use currently available
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// historical estimates.
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// XXX NEEDS TO BE FIXED
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// assert(prevSweep() + splitBirths() >= splitDeaths() + (ssize_t)count, "Conservation Principle");
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// ^^^^^^^^^^^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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// "Total Stock" "Not used at this block size"
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if (inter_sweep_current > _threshold) {
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ssize_t demand = prevSweep() - (ssize_t)count + splitBirths() - splitDeaths();
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// XXX NEEDS TO BE FIXED
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// assert(demand >= 0, "Demand should be non-negative");
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// Defensive: adjust for imprecision in event counting
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if (demand < 0) {
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demand = 0;
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}
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float old_rate = _demand_rate_estimate.padded_average();
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float rate = ((float)demand)/inter_sweep_current;
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_demand_rate_estimate.sample(rate);
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float new_rate = _demand_rate_estimate.padded_average();
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ssize_t old_desired = _desired;
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float delta_ise = (CMSExtrapolateSweep ? intra_sweep_estimate : 0.0);
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_desired = (ssize_t)(new_rate * (inter_sweep_estimate + delta_ise));
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if (PrintFLSStatistics > 1) {
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gclog_or_tty->print_cr("demand: %d, old_rate: %f, current_rate: %f, new_rate: %f, old_desired: %d, new_desired: %d",
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demand, old_rate, rate, new_rate, old_desired, _desired);
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}
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}
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}
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ssize_t desired() const { return _desired; }
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void set_desired(ssize_t v) { _desired = v; }
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ssize_t coalDesired() const { return _coalDesired; }
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void set_coalDesired(ssize_t v) { _coalDesired = v; }
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ssize_t surplus() const { return _surplus; }
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void set_surplus(ssize_t v) { _surplus = v; }
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void increment_surplus() { _surplus++; }
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void decrement_surplus() { _surplus--; }
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ssize_t bfrSurp() const { return _bfrSurp; }
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void set_bfrSurp(ssize_t v) { _bfrSurp = v; }
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ssize_t prevSweep() const { return _prevSweep; }
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void set_prevSweep(ssize_t v) { _prevSweep = v; }
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ssize_t beforeSweep() const { return _beforeSweep; }
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void set_beforeSweep(ssize_t v) { _beforeSweep = v; }
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ssize_t coalBirths() const { return _coalBirths; }
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void set_coalBirths(ssize_t v) { _coalBirths = v; }
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void increment_coalBirths() { _coalBirths++; }
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ssize_t coalDeaths() const { return _coalDeaths; }
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void set_coalDeaths(ssize_t v) { _coalDeaths = v; }
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void increment_coalDeaths() { _coalDeaths++; }
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ssize_t splitBirths() const { return _splitBirths; }
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void set_splitBirths(ssize_t v) { _splitBirths = v; }
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void increment_splitBirths() { _splitBirths++; }
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ssize_t splitDeaths() const { return _splitDeaths; }
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void set_splitDeaths(ssize_t v) { _splitDeaths = v; }
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void increment_splitDeaths() { _splitDeaths++; }
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NOT_PRODUCT(
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size_t returnedBytes() const { return _returnedBytes; }
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void set_returnedBytes(size_t v) { _returnedBytes = v; }
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)
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};
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#endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_ALLOCATIONSTATS_HPP
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